<template>
  <div class="sidebar">
    <el-menu
      class="sidebar-el-menu"
      :default-active="onRoutes"
      :collapse="collapse"
      background-color="#324157"
      text-color="#bfcbd9"
      active-text-color="#20a0ff"
      unique-opened
      router
    >
      <template v-for="item in items">
        <template v-if="item.children !== undefined && item.children.length > 0">
          <el-submenu :index="item.urlIndex" :key="item.urlIndex">
            <template slot="title">
              <i :class="item.icon"></i>
              <span slot="title">{{ item.title }}</span>
            </template>
            <template v-for="subItem in item.children">
              <el-submenu
                v-if="subItem.children !== undefined && subItem.children.length > 0"
                :index="subItem.urlIndex"
                :key="subItem.urlIndex"
              >
                <template slot="title">{{ subItem.title }}</template>
                <el-menu-item
                  v-for="(threeItem, i) in subItem.children"
                  :key="i"
                  :index="threeItem.urlIndex"
                  >{{ threeItem.title }}</el-menu-item
                >
              </el-submenu>
              <el-menu-item v-else :index="subItem.urlIndex" :key="subItem.urlIndex">{{
                subItem.title
              }}</el-menu-item>
            </template>
          </el-submenu>
        </template>
        <template v-else>
          <el-menu-item :index="item.urlIndex" :key="item.urlIndex">
            <i :class="item.icon"></i>
            <span slot="title">{{ item.title }}</span>
          </el-menu-item>
        </template>
      </template>
    </el-menu>
  </div>
</template>

<script>
import bus from "../common/bus";
export default {
  data() {
    return {
      collapse: false,
      items: [
        {
          icon: "el-icon-lx-home",
          urlIndex: "dashboard",
          title: "系统首页",
          sort: 1,
          id: 0,
          parentId: 1,
          children: [],
        },
      ],
    };
  },
  computed: {
    onRoutes() {
      return this.$route.path.replace("/", "");
    },
  },
  methods: {
    async getMenu() {
      await this.$post("/menu/get", null).then((res) => {
        if (res.code === 0) {
          this.items = JSON.parse(res.data);
        } else {
          this.$message.error(res.msg);
        }
      });
    },
  },
  mounted() {},
  created() {
    this.getMenu();
    // 通过 Event Bus 进行组件间通信，来折叠侧边栏
    bus.$on("collapse", (msg) => {
      this.collapse = msg;
      bus.$emit("collapse-content", msg);
    });
  },
};
</script>

<style scoped>
.sidebar {
  display: block;
  position: absolute;
  left: 0;
  top: 70px;
  bottom: 0;
  overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
  width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
  width: 250px;
}
.sidebar > ul {
  height: 100%;
}
</style>
